$BC39/48185: Evaluate <sgn>
BC39: 20 2B BC JSR $BC2B ; Check Sign of FAC#1
Jump from $AF9D, $B07B, $BD83:
BC3C: 85 62 STA $62 ; FAC Mantissa
BC3E: A9 00 LDA #$00
BC40: 85 63 STA $63 ; FAC Mantissa
BC42: A2 88 LDX #$88
Jump from $B39B:
BC44: A5 62 LDA $62 ; FAC Mantissa
BC46: 49 FF EOR #$FF
BC48: 2A ROL
Jump from $BDD4:
BC49: A9 00 LDA #$00
BC4B: 85 65 STA $65 ; FAC Mantissa
BC4D: 85 64 STA $64 ; FAC Mantissa
Jump from $AF81:
BC4F: 86 61 STX $61 ; FAC Exponent
BC51: 85 70 STA $70 ; FAC low-order rounding
BC53: 85 66 STA $66 ; FAC Sign
BC55: 4C D2 B8 JMP $B8D2 ; Perform Addition
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